描述
有的内部继电器还可丢电保持，即它的状态（ON或OFF）、PLC丢电后，靠内部电池仍予以保持。再上电后可继续丢电前的状态。保持继电器可增强PLC控制能力，特别对记录故障，故障排除后恢复运行，更显得有用。
SYMBOL, MOTOROLA 4 SLOT CRADLE WT4090, WT4070 ETHERNET
SYMBOL MOTOROLA LS4208-SWZU0100ZR LS4208 WHITE SCANNER
SYMBOL MOTOROLA LS4208-SBZU0100ZR LS4208 BLACK SCANNER
Motorola Symbol Barcode Scanner PDT3416 New 3416
Motorola Symbol MC9063-S Barcode Scanner Verizon *New*
NEW Motorola Symbol LS 4208 Bar Code Reader
Expedited shipping available
SYMBOL MOTOROLA LS4208-SBZK0200Z KIT: KEYBOARD PS/2, 9F
SYMBOL MOTOROLA LS9203-SR11007NSWR LS9203I:HF STAND,TWL
SYMBOL MOTOROLA LS4208-SBZU0100ZR LS4208 BLACK SCANNER
SYMBOL MOTOROLA LS4208-SWZU0100ZR LS4208 WHITE SCANNER
NEW Motorola Symbol LS 4208 Bar Code Reader
Expedited shipping available
SYMBOL MOTOROLA LS4208-SWZK0100ZR LS4208 WHITE SCANNER
